If there's a rule of thumb when dealing with girls it that girls always act the opposite they mean to... so whenever a girl says no, she actually means yes. And if she says yes... she really means no...
No, I can't confirm this. Girls are always indifferent to some degree, because they lack true insight into their emotions.
So, if you're clever a 'yes' or 'no' doesn't matter at all - you can always generate the desired outcome (gettin' laid).
What you should never do (and OP made this greatest mistake in the universe here) is telling the girl that you love her, before she said that she loves you. This greatly shifts the power in her favor and subconsciously you are assessed as a beta male, who has to take the begging route to copulation. Don't do this!
The best advice in OP's case is that he immediately starts to date other girls and ensures that this information is discretely leaked to her, so she knows that she's not unique and OP is a hot alpha male. Of course OP should have as much fun as possible in the process...
Source of this advice: Experience.
ya.ya.yo!